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... ABSTRACTS AND R E V I E W S 243 10 Full-scale tnals have shown that a fire-retardant surface coating of sodium sihcate/limestone, applied under ideal conditions, can be as effective as an impregnated treatment Fire-retardant coatings, based on materials developed for use as roadway sealants, can seal off underlying timber f rom the effects of heat i n a roadway and, consequently, can confer virtually complete protection on timber For various practical and econonuc reasons, however, impregnated treatment seems likely to remain the mam defense against the fire hazard of numng timber for some time to come Williams-Leir, G . (Division of Building Research, National Research Council of Canada, Ottawa, Canada)

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